When Dr. Carbo leaves the Purple Peacock, returning to Sunset Memorial Hospital, he walks east along Sunset Blvd. Not only is he walking towards the entrance of the very same bar he just left, but he's also heading away from the hospital, which is located less than 500 feet west of him. As if that's not enough, he arrives at the hospital while still walking east down Sunset -- towards the location of the bar.
The first time Marty appeared on the show in season four's "Walk Softly Through the Night" his last name was Herrera. However, in this episode his last name is changed to Carbo.